[docs] [issue16225] list.remove in for loop

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> I agree.  I removed the word "safe" in the patch I attached to reduce
> ambiguity.

Yes, so much the better.

It will be nice somewhere in deep clarify for experts what happens with list 
iterator if the list changed.

And iterating over modifyed (if you insert/remove keys, but not when you only 
update values) dict or set really yield unexpected results (i.e. they expected 
in them undefinability). This is really not recommended.

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<http://bugs.python.org/issue16225>
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